<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
     .container {
         width: 100%;
         display: table;
     }
    .container div {
        display:table-cell;
        min-height: 100px;
    }

    .left {
       width: 200px;
    }


  </style>
</head>
<body>
    <div class="container">
          <div class="left">这是左侧</div>
          <div class="right">这是右侧</div>
    </div>
</body>
</html>